require 'digest/sha1'

class User < ActiveRecord::Base
  has_and_belongs_to_many :roles
	has_many	:pages

	# Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :login, :email, :first_name, :last_name
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :login,    :within => 3..40
  validates_length_of       :email,    :within => 3..100
  validates_uniqueness_of   :login, :case_sensitive => false
  before_save :encrypt_password
  
  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :first_name, :last_name, :login, :email, :password, :password_confirmation
  
  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  def to_param
    "#{id}-#{login.downcase.gsub(/[^[:alnum:]]/,'-')}".gsub(/-{2,}/,'-')   
  end
  
  def get_my_pages
    self.pages.find(:all, :order =>"updated_at DESC")
  end
  
  def is_publisher?
    if self.roles.find(:all, :conditions =>["name =?", "Publisher"]).empty?
			false
		else
			true
		end
  end
  
  def is_editor?
    if self.roles.find(:all, :conditions =>["name =?", "Editor"]).empty?
			false
		else
			true
		end
  end
  
  def is_admin?
    if self.roles.find(:all, :conditions =>["name =?", "Admin"]).empty?
			false
		else
			true
		end
  end
  
  def self.publisher_emails
    @role = Role.find_by_name("Publisher")
    @users = @role.users
    
    @email = []
    
    for user in @users
      @email << user.email
    end
    
    return @email
    
  end
    
	
	#  Determines if a user owns a page.
	#  Example usage:
	#    Note:  The "current_user" method is from the restful_authentication plugin.  
	#						The method can be found in lib/authenticated_system.rm
	#    @user = current_user
	#    @page = Page.find(1)
	#    @user.owns?(@page)
	#    returns True if @user is the owner. 
	def owns?(page)
		self.pages.include?(page)
	end
	
	def full_name
	  self.first_name + " " + self.last_name
	end

	def self.editors
		find(:all, :include => :roles, :conditions => ["roles.name = ?", "Editor"])
	end
	
	# Returns a list of roles as a CSV line for an instance of a user.
	def roles_as_csv
	  roles = Array.new
	  self.roles.each do |role|
	    roles << role.name
    end
    roles * ", "
	end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end
    
    def password_required?
      crypted_password.blank? || !password.blank?
    end
    
end
